fix: Regression for NLB container name (#291)

A regression was introduced in a previous commit, where the NLB
container name is being set to the value of the `alb_container_name`
variable, instead of using `nlb_container_name`.

Co-authored-by: Veronika Gnilitska <30597968+gberenice@users.noreply.github.com>

main.tf

@@ -120,7 +120,7 @@ locals {
     target_group_arn = module.alb_ingress.target_group_arn
   }
   nlb = {
-    container_name   = var.alb_container_name != null ? var.alb_container_name : module.this.id
+    container_name   = var.nlb_container_name != null ? var.nlb_container_name : module.this.id
     container_port   = var.nlb_container_port
     elb_name         = null
     target_group_arn = var.nlb_ingress_target_group_arn